iMac 27" Monitor issue (mini display port in)

After OS X Lion every time I connect my windows laptop to my iMac 27" (Late 2010) and do Command + F2 to use the laptop with the iMac screen and then when done go back to OS X.... I no longer can see my cursor.

The cursor works and exists because if I hit corners and the top I can hit menu items. I just can't see the damn thing. What's up with this and anyone else?

It's really frustrating and I usually have to hold the iMac power button to get out (parallels and other items die a bad death).